Submission #1041610

#	Time	Username	Problem	Language	Result	Execution time	Memory
1041610		Muhammad_Aneeq	Izlet (COI19_izlet)	C++17	18 / 100	1330 ms	36484 KiB

izlet

/*
بسم الله الرحمن الرحيم
Author:
                          (:Muhammad Aneeq:)
*/

#include <iostream>
#include <vector>
#include <set>
#include <map>
using namespace std;
int const N=3e3+10;
int par[N]={};
vector<int>nei[N]={};
vector<int>mem[N]={};
int a[N][N]={};
int an[N]={};
int root(int n)
{
	if (par[n]==n) return n;
	return (par[n]=root(par[n]));
}
set<int>s;
map<int,int>cnt;
void dfs(int u,int root=-1,int v=-1)
{
	if (root==-1)
		root=u;
	if (a[root][u]==s.size())
	{
		an[u]=an[root];
	}
	s.insert(an[u]);
	cnt[an[u]]++;
	for (auto i:nei[u])
	{
		if (i!=v)
			dfs(i,root,u);
	}
	cnt[an[u]]--;
	if (cnt[an[u]]==0)
		s.erase(an[u]);
}
inline void solve()
{
	int subt;
	cin>>subt;
	int n;
	cin>>n;
	for (int i=0;i<n;i++)
		par[i]=i,mem[i].push_back(i);
	for (int i=0;i<n;i++)
		for (int j=0;j<n;j++)
			cin>>a[i][j];
	vector<vector<int>>ans;
	for (int i=0;i<n;i++)
	{
		for (int j=i+1;j<n;j++)
		{
			if (a[i][j]==1)
			{
				int a=i,b=j;
				a=root(a),b=root(b);
				if (a==b)
					continue;
				par[b]=a;
				ans.push_back({a,b});
				for (auto i:mem[b])
					mem[a].push_back(i);
				mem[b]={};
			}
		}
	}
	vector<int>z;
	for (int i=1;i<n;i++)
		if (root(i)==i)
			z.push_back(i);
	vector<int>f;
	f.push_back(0);
	vector<pair<int,int>>g;
	while (z.size())
	{
		vector<int>g,x;
		for (auto i:z)
		{
			bool w=0;
			for (auto j:f)		
			{
				if (a[i][j]==2)
				{
					w=1;
					ans.push_back({i,j});
					nei[i].push_back(j);
					nei[j].push_back(i);
					break;
				}
			}
			if (w==0)
				g.push_back(i);
			else
				x.push_back(i);
		}
		z=g;
		for (auto i:x)
			f.push_back(i);
	}
	for (auto i:f)
		an[i]=i+1;
	for (auto i:f)
	{
		s={},cnt.clear();
		dfs(i);
	}
	for (auto i:f)
	{
		for (auto j:mem[i])
			an[j]=an[i];
	}
	for (int i=0;i<n;i++)
		cout<<an[i]<<' ';
	cout<<endl;
	for (auto i:ans)
		cout<<i[0]+1<<' '<<i[1]+1<<endl;
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
        solve();
}

Compilation message (stderr)

izlet.cpp: In function 'void dfs(int, int, int)':
izlet.cpp:29:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::set<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  if (a[root][u]==s.size())
      |      ~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 0 / 25
• Subtask 3: 0 / 57